In winter 2025, a municipal sanitation department in Xining, Qinghai Province issued a procurement requirement for a China VI-compliant Dongfeng sewage treatment vehicle with a 3308 mm wheelbase, with a budget capped at approximately RMB 427,000. The vehicle is intended for maintenance of the urban sewage pipeline network and emergency sewage treatment. Operating in the high-altitude, sub-zero environment, the vehicle must not only meet China VI emission standards but also demonstrate exceptional cold-start capability and low-temperature hydraulic system stability. Following multiple rounds of tendering and technical proposal evaluations, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') was awarded the contract and delivered two units of this vehicle type, which are now operational in a district of Xining. This article uses this case as a starting point to compare Chengli’s offering against a mainstream market competitor (hereinafter referred to as 'Brand B') across ten core dimensions, providing reference data for similar procurement projects. I. Procurement Background and Key Requirements Xining is located on the Qinghai-Tibet Plateau, where winter temperatures can drop as low as -20°C. The municipal sanitation department explicitly stipulated in its tender documents that the vehicle must be built on a China VI-compliant chassis with a 3308 mm wheelbase; the superstructure must provide sewage collection, solid-liquid separation, temporary storage, and transfer capabilities. Critical evaluation criteria included cold-start performance at -25°C (measured by single-attempt start success rate), low-temperature sealing integrity of the hydraulic system, and overall winter maintenance convenience. Per local procurement practice, suppliers were required to submit complete MIIT (Ministry of Industry and Information Technology) announcement parameters and third-party test reports. Chengli’s model CLW5070GSSD6—based on the Dongfeng 3308 mm wheelbase chassis—fully complied with all requirements: its MIIT announcement parameters are complete and valid nationwide for registration and annual inspection. In contrast, although Brand B’s equivalent-chassis model shared similar base specifications, its suitability for extreme cold environments remained contentious. II. Chengli vs. Brand B: 10-Dimensional Comparative Evaluation Table The following comparison evaluates both models across ten key dimensions: cold-start performance, low-temperature hydraulic stability, winter maintenance support, chassis commonality, superstructure quality, regulatory compliance (MIIT announcement), delivery lead time, after-sales service, cost-effectiveness, and bid responsiveness (maximum score per dimension: 10 points; higher scores indicate superior performance): Evaluation Dimension | Chengli (CLW5070GSSD6) | Brand B (Same-Chassis Model) | Key Remarks ---|---|---|--- 1. Cold-Start Performance | 9.5 | 7.0 | Chengli includes standard low-temperature preheating systems and antifreeze engine oil; achieves 100% successful cold starts at -25°C in field tests. Brand B requires optional equipment for equivalent functionality. 2. Low-Temperature Hydraulic Stability | 9.0 | 6.5 | Chengli employs low-temperature-resistant hydraulic fluid and seals, with zero leakage observed during winter operation. Brand B has received user reports of delayed hydraulic response in cold conditions. 3. Winter Maintenance Support | 9.5 | 6.0 | Chengli provides a dedicated winter maintenance kit (including antifreeze coolant, preheater inspection, and hydraulic oil replacement), plus lifetime free technical support. 4. Chassis Commonality | 10 | 10 | Both utilize the Dongfeng China VI 3308 mm wheelbase chassis, enabling nationwide warranty coverage and interchangeable parts. 5. Superstructure Quality | 9.0 | 8.0 | Chengli’s tank is fabricated from high-strength steel with corrosion-resistant treatment; Brand B uses standard carbon steel. 6. Regulatory C